#!@PYTHON@
#    This file is part of GNUnet.
#    (C) 2011, 2018 Christian Grothoff (and other contributing authors)
#
#    GNUnet is free software: you can redistribute it and/or modify it
#    under the terms of the GNU Affero General Public License as published
#    by the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    GNUnet is distributed in the hope that it will be useful, but
#    WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
#    Affero General Public License for more details.
#   
#    You should have received a copy of the GNU Affero General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Utility module that implements safe process termination for W32.
# For other platforms it's equivalent to Popen.kill ()
# Requires pywin32 on W32.

import sys
import subprocess
import os
if os.name == 'nt':
    import win32api
    import win32process


class dummyobj (object):
    pass


def safe_terminate_process_by_pid(pid, code):
    if os.name == 'nt':
        p = dummyobj()
        p._handle = win32api.OpenProcess(2 | 1024 | 8 | 32 | 16, 0, pid)
        result = safe_terminate_process(p, code)
        win32api.CloseHandle(p._handle)
        return result
    else:
        # XXX (F821): Undefined name 'SIGKILL'
        return os.kill(int(pid), SIGKILL)


def safe_terminate_process(proc, code):
    if os.name == 'nt':
        cp = win32api.GetCurrentProcess()
        result = False
        dupproc = win32api.DuplicateHandle(cp, proc._handle, cp, 2 | 1024 | 8 | 32 | 16, 0, 0)
        try:
            exitcode = win32process.GetExitCodeProcess(dupproc)
            if exitcode == 0x103:
                kernel32 = win32api.GetModuleHandle("kernel32")
                exitprocess = win32api.GetProcAddress(kernel32, "ExitProcess")
                th, tid = win32process.CreateRemoteThread(dupproc, None, 0, exitprocess, code, 0)
                win32api.CloseHandle(th)
                result = True
            else:
                result = True
        # except failed to get exit code? failed to get module handle?
        finally:
            win32api.CloseHandle(dupproc)
        return result
    else:
        return proc.kill()
